Z. Hamadi, J. Moncef, H. Néjib, and A. Cherif
MPPT, PWM, modelling, MATLAB/SIMULINK
In this paper, we will observe by simulation and experimental results how good monitoring and control of a PV plant can increase its efficiency and reliability and consequently reduce the PV cost. We introduce a new strategy of modelling and control of photovoltaic pumping systems under MATLAB/SIMULINK environment. This approach is based on the dynamic model of the “PV-MPPT inverter- MLI inverter-motor-pump association. The MPPT control allows extraction of the maximum output power of the PV cell. However, the PWM inverter ensures a sine wave current to the AC motor with a low distortion ratio. This methodology provides an optimal control of DC/DC and DC/AC converters thanks to dynamic control laws, respectively, the DC-DC cyclic ratio and the inverter frequency. It is programmed in a MATLAB-SIMULINK interface for best prediction of the PV system behaviour, especially with climatic and load fluctuations. The simulation results are validated by experimental measurements that are collected from several stand- alone PV plants.
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